** Shares of oil refiners rise as crude oil prices fall
** Crude prices dropped after U.S. President Donald Trump’s threat of new tariffs on China reignited fears of a trade war between the world’s two biggest economies
** Brent crude for June delivery was down 32 cents, or 0.5 percent, at $68.01 per barrel at 0410 GMT.
** Shares of Bharat Petroleum Corp Ltd and Hindustan Petroleum Corp Ltd climb as much as 2.2 pct and 2.4 pct, respectively
** Mangalore Refinery and Petrochemicals Ltd jumps as much 3.36 pct to 115.25 rupees - biggest intraday pct gain since Feb. 26
** Nifty Energy Index up 0.8 pct, on track to gain for a second straight session